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Method for restraining sparse adaptive direct wave and noise wave of passive bistatic radar

A bistatic radar and clutter suppression technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as increased calculation, decreased algorithm convergence speed, and increased sampling points

Inactive Publication Date: 2015-05-27
HOHAI UNIV
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Problems solved by technology

Due to the increase of communication signal rate, the sampling points spanned by channel clutter are greatly increased, resulting in a significant increase in the length of the LMS filter
The increase in the length of the weight vector will lead to a decrease in the convergence speed of the algorithm and a large increase in the amount of calculation
Taking the digital TV signal as an example, the current bandwidth is about 8MHz, while the bandwidth of the sound frequency modulation of traditional analog TV that can be used as an external radiation source is less than 100kHz

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  • Method for restraining sparse adaptive direct wave and noise wave of passive bistatic radar
  • Method for restraining sparse adaptive direct wave and noise wave of passive bistatic radar
  • Method for restraining sparse adaptive direct wave and noise wave of passive bistatic radar

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[0040] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0041] Such as figure 1 As shown, it is a block diagram of passive bistatic radar signal processing flow. Passive bistatic radar has two channels: 1) reference channel, which mainly receives direct waves; 2) monitoring channel, which is mainly used for digital beamforming (DBF) and autonomous Adaptive filtering suppresses direct waves and multipath. The direct wave signal of the reference channel and the signal of the monitoring channel are used to complete the range-Doppler cross-correlation calculation and target detection.

[0042] Passive bistatic radar reference channel received signal x at time k R (k) is,

[0043] x R (k)=s(k)+n R (k)

[0044] In the formula, s(k) is the emission s...

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Abstract

The invention discloses a method for restraining sparse adaptive direct wave and noise wave of a passive bistatic radar. For the passive bistatic radar adopting high-speed communication signals as an illumination source, the method adopts a sparse processing method to improve an adaptive least mean square error (LMS) algorithm according to the sparsity of channel noise wave during the compensation of the direct wave and the noise wave, and effectively reduces the calculated amount of the algorithm.

Description

technical field [0001] The invention relates to a sparse adaptive direct wave and clutter suppression method, in particular to a sparse adaptive direct wave and clutter suppression method suitable for passive bistatic radar. Background technique [0002] The passive bistatic system radar adopts non-cooperative illumination sources, and the passive bistatic radar transmits and receives separately. It has strong concealment and can effectively avoid the enemy's reconnaissance and attack. It is suitable for future technical applications. [0003] FM radio, second-generation communication signals, high-frequency radar, digital radio and television signals and other unintentional radiation sources can be used as non-cooperative radiation sources for passive bistatic radar. With the rapid development of digital technology, the rate of communication systems has increased rapidly, such as digital TV signals, third-generation mobile communication signals, and so on. These signals ar...

Claims

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Application Information

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IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 王峰蒋德富
Owner HOHAI UNIV
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